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/*****************************************************************
* gmerlin-avdecoder - a general purpose multimedia decoding library
*
* Copyright (c) 2001 - 2012 Members of the Gmerlin project
* gmerlin-general@lists.sourceforge.net
* http://gmerlin.sourceforge.net
*
* This program is free software: you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation, either version 2 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
* *****************************************************************/
#include <stdlib.h>
#include <avdec_private.h>
#include <codecs.h>
#ifdef HAVE_GSM_GSM_H
# include "gsm/gsm.h"
#else
# include "GSM610/gsm.h"
#endif
/* Audio decoder for the internal libgsm */
/* From ffmpeg */
// gsm.h miss some essential constants
#define GSM_BLOCK_SIZE 33
#define GSM_FRAME_SAMPLES 160
// #define GSM_BLOCK_SIZE_MS 65
// #define GSM_FRAME_SIZE_MS 320
#define LOG_DOMAIN "gsm"
typedef struct
{
gsm gsm_state;
bgav_packet_t * packet;
uint8_t * packet_ptr;
gavl_audio_frame_t * frame;
int ms;
} gsm_priv;
static int init_gsm(bgav_stream_t * s)
{
int tmp;
gsm_priv * priv;
/* Allocate stuff */
priv = calloc(1, sizeof(*priv));
priv->gsm_state = gsm_create();
s->decoder_priv = priv;
if(s->data.audio.format->num_channels > 1)
{
gavl_log(GAVL_LOG_ERROR, LOG_DOMAIN,
"Multichannel GSM not supported");
return 0;
}
if((s->fourcc == BGAV_WAVID_2_FOURCC(0x31)) ||
(s->fourcc == BGAV_WAVID_2_FOURCC(0x32)))
{
priv->ms = 1;
tmp = 1;
gsm_option(priv->gsm_state, GSM_OPT_WAV49, &tmp);
}
/* Set format */
s->data.audio.format->interleave_mode = GAVL_INTERLEAVE_NONE;
s->data.audio.format->sample_format = GAVL_SAMPLE_S16;
s->data.audio.format->samples_per_frame = priv->ms ? 2*GSM_FRAME_SAMPLES : GSM_FRAME_SAMPLES;
gavl_set_channel_setup(s->data.audio.format);
priv->frame = gavl_audio_frame_create(s->data.audio.format);
if(priv->ms)
gavl_dictionary_set_string(s->m, GAVL_META_FORMAT,
"MSGM");
else
gavl_dictionary_set_string(s->m, GAVL_META_FORMAT,
"GSM 6.10");
return 1;
}
static void close_gsm(bgav_stream_t * s)
{
gsm_priv * priv;
priv = s->decoder_priv;
if(priv->frame)
gavl_audio_frame_destroy(priv->frame);
gsm_destroy(priv->gsm_state);
free(priv);
}
static gavl_source_status_t decode_frame_gsm(bgav_stream_t * s)
{
gavl_source_status_t st;
gsm_priv * priv;
priv = s->decoder_priv;
if(!priv->packet)
{
if((st = bgav_stream_get_packet_read(s, &priv->packet)) != GAVL_SOURCE_OK)
return st;
priv->packet_ptr = priv->packet->data;
}
else if(priv->packet_ptr - priv->packet->data + // Data already decoded
GSM_BLOCK_SIZE + priv->ms * (GSM_BLOCK_SIZE-1) // Next packet
> priv->packet->data_size)
{
bgav_stream_done_packet_read(s, priv->packet);
if((st = bgav_stream_get_packet_read(s, &priv->packet)) != GAVL_SOURCE_OK)
return st;
priv->packet_ptr = priv->packet->data;
}
gsm_decode(priv->gsm_state, priv->packet_ptr, priv->frame->samples.s_16);
priv->frame->valid_samples = GSM_FRAME_SAMPLES;
if(priv->ms)
{
priv->packet_ptr += GSM_BLOCK_SIZE;
// priv->packet_ptr += block_size-1;
gsm_decode(priv->gsm_state, priv->packet_ptr,
priv->frame->samples.s_16+GSM_FRAME_SAMPLES);
priv->frame->valid_samples += GSM_FRAME_SAMPLES;
priv->packet_ptr += GSM_BLOCK_SIZE-1;
}
else
priv->packet_ptr += GSM_BLOCK_SIZE;
gavl_audio_frame_copy_ptrs(s->data.audio.format, s->data.audio.frame, priv->frame);
return GAVL_SOURCE_OK;
}
static void resync_gsm(bgav_stream_t * s)
{
gsm_priv * priv;
priv = s->decoder_priv;
priv->frame->valid_samples = 0;
if(priv->packet)
{
bgav_stream_done_packet_read(s, priv->packet);
priv->packet = NULL;
}
priv->packet_ptr = NULL;
}
static bgav_audio_decoder_t decoder =
{
.fourccs = (uint32_t[]){ BGAV_WAVID_2_FOURCC(0x31),
BGAV_WAVID_2_FOURCC(0x32),
BGAV_MK_FOURCC('a', 'g', 's', 'm'),
BGAV_MK_FOURCC('G', 'S', 'M', ' '),
0x00 },
.name = "libgsm based decoder",
.init = init_gsm,
.decode_frame = decode_frame_gsm,
.resync = resync_gsm,
.close = close_gsm,
};
void bgav_init_audio_decoders_gsm()
{
bgav_audio_decoder_register(&decoder);
}
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